The ultraviolet ray is a double-edged sword

The ultraviolet ray is a double-edged sword
For a long time, people only know the ultraviolet ray is beneficial to the human body, for instance, the ultraviolet ray promotes the synthetic function of vitamin D, can help the growth of the skeleton, the children in growth stage get sun more, in the outdoor sports more, help to prevent rickets. Ultraviolet ray can make microbial the intersection of cell and the intersection of kernel and acid, former the intersection of thick liquid and albumen the chemical change take place and for example, so can be used to kill microorganisms, to the air, water, pollute the surface of object to sterilize and sterilize. However, the scientists' research indicates again, the adverse effect to the human body of ultraviolet ray can't be neglected in recent years. What is the ultraviolet ray some of human body to influence on earth? I have visited burning the expert of department, ophthalmology department, dept. of dermatology of Shanghai Rui Jin hospital. The ultraviolet ray refers to the sunlight of the wavelength among 200nm- 380nm, include 3 kinds: UV-A wavelength is 315nm- 380nm, UV-B wavelength is 280nm- 315nm, UV-C wavelength 200nm- 280nm. Reach the sunlight of surface of the earth (290nm- 2000nm) The ultraviolet ray in China accounts for 13%, among them UV-A accounts for 97%, UV-B accounts for 3%, UV-C approaches 0. The ones that will cause damaging to people's skin are UV-A, VU-B. UV-C ultraviolet lamp made through the special craft, can be used for sterilizing and sterilizing. Section UV-A is called the tanned Section, its injury to people's skin accumulates over a long period. Burning department's professor should remind what everybody paid attention to it is section UV-B, section UV-B is called shining the red Section, the ultraviolet ray can reach the epidermis floor while penetrating strength, can sunburn the skin, clinical manifestation is flush for skin, burns and aches obviously, can present small blister, begin to peel one week later. This is a main wave band that people must be watchful. Every summer, institute this burn department door emergency call have tourist, open-air swimmer because sunlight dermatitis go to a doctor. The expert warns everybody: Make sure not to shine the ultraviolet ray excessively and for a long time, if present the above-mentioned symptom, want the cleaning which keep some, carry on the shelter of the skin appropriately, don't get small blister broken. Rui Jin the intersection of hospital and ophthalmology director think ultraviolet ray's injury to human eye mainly depend on its wavelength, radiate time, intensity and human eye to defend the power of the mechanism. Scientific research verifies, the strong sunlight is the main reason that people suffer from cataract. Researcher of the university of Sri Lankan American John Hopkin thinks, the sun shining for 1 more hour every day, suffer from 10% of dangerous increase of cataract in one year. The danger that outdoor workers suffer from cataract is 3 times of the common people's. The cornea, crystal are the part most often damaged by the ultraviolet ray, it is eye disease closely related to it too that the cover is damaged in the sunlight cornea, its impact on conjunctiva, eyelid is relatively small. Suffer from sunlight cataract can undergo an operation treatment. To that everybody care about generally ultraviolet ray being can carcinogenic to say head of the department points out the skin, the investigation indicates, the long-term accumulation injury of the ultraviolet ray can bring out skin carcinoma in Australia. This investigation finds too, the proportion that the ultraviolet ray of white race brings out skin carcinoma is obviously higher than yellow. Certainly, UV-B wave band of different wavelength can also treat rheumatoid arthritis, dermatosises such as lupus erythematosus, silver the intersection of bits and disease, scleroderma, vitiligo, chaff rash of the rose and skin T cellulous lymphoma,etc., so people needn't turn pale at the mere mention of sth. terrible to the ultraviolet ray. The ultraviolet index expresses with 0- 15, refer to the inner sun for one day when the position is highest in the sky (usually around noon) Reach the intensity of injury that UV radiation may form to the human skin in the sunlight of the ground. Usually stipulate it is 0 at night, it is 15 when the tropical zone, highland are fine and cloudless. The bigger the ultraviolet index is, damage the the bigger intensity to the human body. Recently, all in the weather forecasts of a lot of cities the ultraviolet project as predicting conventionally of radiation situation, in order to remind people to protect in time. Prevent the injury to the human body of ultraviolet ray, the main one is to prevent from long-timely to move about under the strong sunshine. In addition, it is very necessary too to take some safeguard procedures, when there are outdoor sports that strong sunshine is shining, prevent the ultraviolet ray from contacting the skin directly with the sunshade of the light color, wear the sunglasses in order to stop the stimulus of the ultraviolet ray cross-eye partly, scribble and apply suncream,etc. appropriately. Don't expose the skin to the light when sterilize and sterilize with the ultraviolet lamping.

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